An advertiser can request to advertise on a property (online or offline) that does not participate in advertising network. The advertiser may specify how much it would be willing to pay to advertise on the property, among other constraints (e.g., time, geotargeting, etc.) An advertising network or an independent entity can contact the non-participating property, and may include information about the interest that advertiser(s) have expressed in advertising on the property. The information may be some value aggregated over a number of advertisers. The form of the contact (e.g., email, telephone call, in person visit, etc.) can be a function of the level of interest expressed.